JPH0361804B2 - - Google Patents

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Field of Application) The present invention relates to a method for constructing a bridge, particularly a truss structure having a large span, piers and abutments, and mainly made of steel. This invention relates to a method of constructing a bridge having a bridge body.

(Prior art) For example, a bridge as shown in FIG. 10 has piers 2, 2 between abutments 1, 1, and shoes 3, 3, etc. In the construction of a bridge in which a truss-structured bridge body 4 is erected, a bent construction method or an overhang construction method is generally employed.

Among these, the overhanging method involves, as shown in Fig. 11, four parts of the bridge body being erected using construction supports 5, 5, etc., and then sequentially extending from section A to section B while using the four sections of the bridge body as counters. I'm trying to build a structure.

In addition, as an alternative method to the overhang construction method, as shown in Fig. 12, diagonal supports 6, 6 for erection are provided on the bridge piers 2, and the bridge body 4 is successively extended from side to side using these diagonal supports. (Refer to the publication, Steel Road Bridge Construction Handbook, published by the Japan Road Association).

(Problems to be Solved by the Invention) However, the conventional overhang construction method described above has a major problem in that it requires a large amount of construction materials and equipment including shoring.

The reason for adopting the above construction method is that abutment 1 and pier 2
The bridge body 4 is supported by shoes 3, 3, etc., which can be rotated or rotated and horizontally moved on the upper part of the bridge, and the side that should serve as a counter is adopted due to the structure in which this load is transmitted to the abutments 1 and piers 2 of the substructure. This is because the overhang construction method cannot be used without the bridge body and diagonal supports 6, 6 for the span.

Furthermore, when the construction of the entire bridge is completed, the shoes 3 on the piers 2 may need to be raised and lowered in order to release the initial stress introduced during construction, but since the bridge body 4 is huge, the above This makes the work extremely dangerous and extremely difficult.

Especially during the erection of the bridge body in the above-mentioned overhanging work,
Since the work will proceed with the bridge body temporarily fixed,
There were various problems such as the fact that they were often placed in extremely dangerous conditions under the load of abnormal events such as earthquakes and typhoons.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above problems, the bridge body has a truss structure made of members mainly made of steel, and the bridge piers are mainly made of concrete, etc. , the connecting parts of the upper chord, lower chord, and diagonal members that make up the truss structure bridge body are fixed and completed on the left and right sides of the pier, and each component of the bridge body is connected to the joint parts completed on the left and right sides of the pier. The bridge body is rigidly integrated with the piers by sequentially extending and constructing the bridge.

(Embodiment) The present invention will be described below with reference to the embodiment shown in FIGS. 1 to 9, using the same reference numerals for the same members as in FIGS. 10 to 12.

Figures 1 and 2 show the overall structure of a bridge constructed using the construction method according to the present invention. The case is shown in which the steel lower chord member is reinforced with reinforced concrete 7 in consideration of the fact that the nearby lower chord member receives a very large compressive force.

In the present invention, the connecting parts 11, 12, and 13 for connecting the upper chord member 8, lower chord member 9, and diagonal member 10 of the bridge body 4 having a truss structure are integrally fixed to the pier 2, which is mainly constructed of concrete. It has been completed.

Figures 3 to 5 show the above-mentioned connecting parts 11, 12, 1.
3 shows an example of the installation structure.

In the case shown in the third figure, upper chord connecting parts 11, 11 and diagonal connecting parts 13, 13 are provided on both sides of the upper part of the steel column 14.
A connecting member having lower chord connecting parts 12, 12 on both sides of the lower part is integrated with the pier 2 by burying the steel column 14 part in the pier 2 during the construction stage of the pier 2. The bridge pier structure is such that upper chord connecting parts 11, 11, diagonal connecting parts 13, 13, and lower chord connecting parts 12, 12 are respectively projected from both sides of the pier 2.

In the case shown in FIG. 4, anchor bolts 15 and 16 are buried in predetermined positions during construction of the pier 2, and the upper chord connecting portions 11 and
11, Diagonal member connecting portions 13, 13 and lower chord connecting portion 1
2 and 12, the upper chord connecting parts 11, 11, the diagonal connecting parts 13, 13, and the lower chord connecting parts 12, 12 protrude from both sides of the pier 2, respectively. It is said to be a pier structure.

Further, in the case shown in the fifth figure, the upper chord connecting portion 11,
11, Diagonal member connecting part 13, 13, Lower chord member connecting part 1
2 and 12 is attached to the anchor bolt 1 buried in the upper end of the pier 2 during the construction stage.
Each connecting portion is connected to the bridge pier 5 and integrated with the pier 2.

6 to 9 show the construction order in the case of constructing the bridge body 4 having a truss structure on the bridge pier 2 shown in the third figure.

As shown in FIG. 7, the procedure for constructing the bridge body 4 is as shown in FIG.
While rigidly connecting the upper end, the left and right bottom chord connecting parts 1
The lower chord members 9, 9 are rigidly connected to the lower chord members 9, 12, and the lower ends of the diagonal members 10, 10 are rigidly connected to the connecting portions 9A, 9A formed at the tips of the lower chord members 9, 9.

Next, from this state, as shown in FIG. 8, one end of the upper chord members 8, 8 is rigidly connected to the left and right upper chord members connecting portions 11, 11, and the tips of each of the upper chord members 8, 8 and the lower chord members 9, 9 are connected. Vertical members 1 are attached to the joints 8A, 8A, 9A, 9B.
6 and 16 are rigidly connected.

After that, similarly to the beginning, the diagonal members 10, 10 are rigidly connected to the connecting parts 8B, 8B at the tips of the upper chord members 8, 8, and the next lower chord members 9, 9 are rigidly connected to the tips of the lower chord members 9, 9, respectively. 10, 10 and the lower chord members 9, 9, the bridge bodies 4 are successively extended to the left and right of the piers 2, and finally both piers 2 are attached at the center O of the span in FIG. , 2 are joined together to complete the bridge between the piers 2, 2.

In addition, the bridge body 4 extended on the opposite side of the piers 2, 2,
4 is connected on the abutment 1,1 to complete the bridge between the abutment 2,2 and the abutment 1,1.

In addition, as shown in the second figure, when the lower chord members 9, 9 rigidly connected to the lower chord connecting parts 12, 12 of the pier 2 are reinforced with reinforced concrete 7, the lower chord members 9, 9
After stiffening, formwork is assembled, reinforcing bars are placed, concrete is poured and hardened, and then the next work of connecting the lower chord members 9 is started. By doing so, the lower chord member 9 near the pier has a composite structure with concrete, and the strength of the part receiving the largest compressive load can be maintained sufficiently.

〔Effect of the invention〕

As explained above, the present invention provides a bridge structure in which the bridge body is a truss structure made of members mainly made of steel, and the bridge piers are made mainly of concrete, etc. , each connection part of the diagonal members is fixed and completed on the left and right sides of the pier, and each component of the bridge body is connected to the connection parts completed on the left and right sides of the pier, and the bridge body is stretched out one after another, and the bridge body is rigidly connected to the pier. Since the bridge was built by integrating it, it became possible to significantly reduce the amount of construction materials and equipment that were considered essential when constructing a bridge using the conventional overhang method, and the economic effect obtained was Extremely large.

In particular, when constructing the bridge body by extending it from the piers, it is not temporarily fixed as in conventional construction methods, but is completed, so it is extremely safe even under abnormal loading conditions due to earthquakes, typhoons, etc. during the construction period. .

In addition, since the construction method involves integrating the bridge body with the piers, it is possible to partially construct the truss structure using a composite structure made of steel and concrete, allowing for more economical design when designing components. be able to.

Further, according to the method of the present invention, there is no need to use expensive shoes, so construction costs can be reduced, and various superior effects can be obtained compared to the conventional overhang construction method.

[Brief explanation of drawings]

Fig. 1 is a front view showing an example of a bridge constructed by the method of the present invention, Fig. 2 is a front view showing another example of the same, and Figs. 3 to 5 A and B are connecting parts of bridge piers in the present invention. 6 to 9 are partial front views showing structural examples of
The figures are explanatory diagrams showing the construction order, Figures 10 to 12.
The figure is an explanatory diagram showing the conventional overhang construction method. 1... Bridge abutment, 2... Pier, 4... Bridge body, 7...
Composite member of steel and concrete, 8...Top chord member, 9
...Lower chord member, 10... Diagonal member, 11... Upper chord connecting part, 12... Lower chord member connecting part, 13... Diagonal member connecting part, 14... Steel column, 15, 16... Anchor bolt.

Claims (1)

[Claims] 1. In constructing a bridge where the bridge body is a truss structure made of members mainly made of steel, and the piers are mainly made of concrete, etc., A bridge characterized in that the bridge body is fixed and completed on the left and right sides of the pier, and the bridge body is rigidly integrated with the pier by construction in which each component of the bridge body is successively connected and extended to the connecting parts that are completed on the left and right sides of the pier. How to build.